Running like a dog between 1500 - 3000 revs

[RAFBOY]

Ive noticed recently that at low revs under 3000rpm that my baby isnt too happy, while on the Friday evening temporary car park which is the northbound M1 yesterday she was very jerky at low revs, she's great above 3000 but as soon as she dips under that in any gear shes like a dog. Any advice would be greatly appreciated....

[the gazman]

Mine was the same and it turned out to be needing the airflow meter and throttle pot values resetting.
My car jumped up powerwise and is soooo much better behaved on the M25.

[RAFBOY]

Cheers the gazman, will try that !!

[old64er]

I think the closed loop on the lambda cuts in about then.

Have you had the emissions checked?

Edited by old64er on Saturday 7th October 19:08

[the gazman]

Just make sure somebody does it who knows what they are doing because the values on my 4l car were different depending whether you had cats fitted or not.

Info on the RPI site I understand.

Edited by the gazman on Saturday 7th October 21:54

[RAFBOY]

Hi old64er , No i havent, she's ok on idle so i was thinking down the line of oil build up on the butterfly valve perhaps??? and will try wot the gazman reccomended aswell..

[GreenV8S]

I agree with old64er, assuming your car is a cat model it's most likely a problem in the lambda feedback system. Check the lambda sensors, you should be able to see each sensor cycling between 'rich' and 'lean' when the engine is running with a steady throttle. If it isn't cycling, or only cycling very slowly (slower than say once a second) you have a duff lambda sensor, or some other fault causing over- or under-fuelling that is overwhelming the lambda feedback system. If it's only one side with the problem, it's almost certain to be the sensor. You can confirm this by swapping the sensors over - if the problem goes with the sensor, the sensor is definitely at fault.

[RAFBOY]

GreenV8S said:

I agree with old64er, assuming your car is a cat model it's most likely a problem in the lambda feedback system. Check the lambda sensors, you should be able to see each sensor cycling between 'rich' and 'lean' when the engine is running with a steady throttle. If it isn't cycling, or only cycling very slowly (slower than say once a second) you have a duff lambda sensor, or some other fault causing over- or under-fuelling that is overwhelming the lambda feedback system. If it's only one side with the problem, it's almost certain to be the sensor. You can confirm this by swapping the sensors over - if the problem goes with the sensor, the sensor is definitely at fault.

Thanx greenv8s will take a looksee ..